Machine for sharpening saw teeth



Feb 9, 1932. L.M.LQFT1N 1,844,775

MACHINE FOR SHARPENING SAW TEETH Filed Aug. 14, 1930 2 Sheets-Sheet 1Feb. 9, 1932. L M. LOFTIN 1,844,775

MACHINE FOR SHARPENING SAW TEETH Filed Aug. 14, 1930 2 Sheets-Sheet 2III/II/IIII/IIII [III/III,

gwmzwtoc IIIIIIIIIIIIIIIIIlIIII/IIIIII/lb Patented" Feb. 9, I932 1 44sireees? m LOFTIN- OF "OXFORD, NORTH CAROLINA MACHINE: FOBi SHARPEN'INGTEETH 1 Appji'catiom filerl Augqustum, 193fi.-. Serial N6; $75,285. it

inVQHtiOIIIBEItQS tU'CBDtZtiiY'iDTPIOVe; Whic11the'entire supp grtingments .int machines'ifor sharpening saw teethig and carrying armtogether withthe grinding and the nature an'dob'jects ofthe invention"Wheelmountedantifcarried' tlfer'eonisrecip, wilibeireadiij recognizedandunderstoodby rooated' as 'aunitdirectly from'the grinding, 5' thoseskiiledin'the art'in'the light offth-e"tol WheelIdrivingendrritatingmechanism. lowing explanation and detaiied description" Affirther objectfoftheinvention is to prooi the accompanying drawingsillustrating violeaccurate and i readilj operated*mech'a whatIatpresent-consider to b'ethe preferred nismsfor adjustilng thegrindingmachine to embodiment or mechanical "expression. of "my;position the same onvarious types and siZes in'ventionmfrom amongvarious other forms ofsaw' bla'desand saw teeth'sp acings'of suchi'=="arrangements, embodiments, combinations blades, as"Welliesforraccurately adjiisting, andconstruotionsoi whiclftheinvention is-* and p'ositioningftherotarygrindingwheelto capable ithinthe-spiritand the scope there-Q meet the sharpeningj'andgrindi'ngjrequifew of." ments for the particular; saw teeth-to be Theinvention presentsa portable type of shwrpenedfi and; fiirther to rovideu h saW-toothgrindingjandsharpening;machine mechanisms of aconstructionend arrange- Which includsa rotary grindingwh'eel, for1119111; such'aszto redrloethe'ppssibilityoftheiimounting-am}positioning on and s1I-ppo-rted desi1:ed*settings .anda'd'jns'tments'when once .by a sawlb ladeiwith the rotary grinding Wheelmade; being disturbech or" deranged inrth'e position-ed forisharpening asaw tooth, such" operationofthemachine and in moving the 7 as the typeofpprtahlei. saw tooth sharppnmachinefrom' to'oth"to' tooth" in'sharpeningw ing machine disclosed in 1ny;p ending, United" the teeth ofa saw. w States patent application filed 31", 1930; Anotherob ject of"the invention" is to-"pro- -SerialNo. 458,642; and a main andv general'I vid an arrangement*for-mouhting.and'siipobject oflmy instantinvention is to matee-e p'ortingthe sharpening"machine on a saw"riallyimprove thertypeof 'maehine ofmy, blade and positioning the rotarygrinding" aforesaid'pending application so as to. int-w wheelili"sharpening"p'ositioniwith respect "to crease the efiiciency thereofto secure more the-toothitobesharpenech through' the me- ;acouratesharnening :ofl'thie. teethiof'YaL saw, diinn'of a positioniiigmemben'carrid by the:

While atthesamentime.simplifyingmueh ma: machine and engaged with thethroat of 'ia' an chines structurally and mechanicaliy, tooth adjacentthetooth to? besharpen'ed "so Another. object offthe invention. is Ltoproas-to'properlj' and acourateiyloca'teathema-1 vide.amountingmarrangementifonsuchaimm chine and en a'bie mounting ofz'thesame from. chine by which I it. can benaore. easily and; tooth aotooth'jon the saw to 'accu'ratelyseourei quicklymountedon .iaxsawlbl adeand. moved the same positioning. of the machine and" Q andIpositioned.fromtoothpto tootlinthereo n mdiln a lfl li 5 w to th ifhb twhich arrangement enables. the: machine to dj ii ot t @511 i -A be bepositively locatedito accurately position i sharpened; tz e z-w 'w z i lgi i Anotherobjectof 'theinvention is topro a 2 323; Vifl amaclrineenrhbdj ing thealo ovejenum'er alignment with ahsaw :toothbeinggsharpenedlg ii ispracticallyeliminaterltoinsure theadesired ig j.f g w 1 y 5 3 degree and accuracy offthe i grinding; and i t Wh ishmipeninghoixheisaw teeth, JGCiTBd HIUEG', and:o-i?asimplestruotioAnother ohject off'the inventiomis to pro-- Pfficlefia QP Q w h' f livide a mechanically simple arrangement for 11mm I '3?- h rW hreciprocatingthe rotary grinding wh'eel hack: be 'eificlently'gfoperateduneki'lleol lahor to 50 and forth and transversely acrossa'saw toothprocince'aco rate saty'teethrsharpen ng;i H

in grinding and sharpeningthe some, by Vihth'the foregolng objects andresults "in iii) view, as well as certain others arising from featuresof the invention hereinafter described and explained, the inventionconsists in certain novel features in construction and in combinationsand arrangements of parts as will be more fully and particularlyreferred to and specified hereinafter.

Referring to the accompanying drawings, in which similar referencecharacters refer to corresponding parts throughout the several figuresthereof: v

Fig. 1 is a view in side elevation of a saw tooth sharpening machineembodying my invention, in operative adjusted position on a rotary saw,a portion only of the saw being shown with the rotary grinding wheel inoperative tooth sharpening position.

Fig. 2 is a view in side elevation of the machine mounted on a saw, buttaken from the opposite side of the machine from that of 1, and showingparticularly the adjustable supporting and positioning mechanism and theclamp for releasably securing the machine in position on the saw blade.

Fig. 3 is a transverse vertical section through the machine casing takenin a plane above but substantially parallel to the reciprocatinggrinding wheel carrying arm and showing such arm in top plan.

Fig. at is a detail vertical section through a portion of the casing ofthe machine and saw blade on which mounted, showing particularly thearrangement of adjustable saw blade engaging and machine supportingmembers together with the clamp for releasably securing the machine inposition on the saw blade.

Fig. 5 is a view in end elevation of the grinding wheel and wheel shaftcarrying head of the reciprocating arm of the machine.

Fig. 6 is a transverse section through the extensible grindingwheelcarrying and reciprocating arm, taken on the line 6-6 of Fig. 3. i

One form and embodiment of a machine expressing the several features ofthe invention is illustrated in the drawings as operatively mounted insaw tooth sharpening position on a saw S of the rotary wood cutting typehaving a series of saw tooth receiving recesses spaced therearound andformed in the periphery of the saw blade in the usual manner for suchtypes of saws. .A curved saw tooth or bit T is mounted and removablyinserted and held in position in each recess by a curved member or ringR, in a manner familiar in the art, with each saw tooth T curved orextended inwardly a distance across its recess in the direction of sawrotation, and terminating at its forward outer end in a transversecutting or chisel-like edge E having a beveled under face or surface E(see Figs. 1 and 2). Each tooth T in the type thereof here shown isformed with a shoulder 1 on the outer side thereof which abuts againstand engages the adjacent edge of the .saw blade at the outer side of therecess in which mounted to hold the tooth against displacement, in amanner understood in the art, and each tooth T is also formed with andprovides a throat 2 or curved inner edge portion adjacent the cuttingedge T and beveled under face 4 thereof, as will be clear by referenceto Figs. 1 and 4 of the drawings in particular.

While a rotary wood saw of the inserted tooth type as described above ishere illustrated, it is to be clearly understood that the invention isnot limited or restricted to a machine for grinding and sharpening theteeth of saws of this type, as a machine of the invention, such as theform thereof here shown, is intended for and adapted to mounting on andsharpening the teeth of reciprocating saws, band saws and other types,as well as rotary saws, and to rotary and other types of saws havingintegral teeth or other forms of inserted teeth. The type of rotary,inserted tooth saw S here shown, is selected because it presents theconditions and difficulties surrounding tooth sharpening which themachine of the invention is designed to overcome, in a marked degree.

In accordance with the invention a portable machine is provided forremovable mounting on the saw S to position the rotary grinding wheel ofthe machine'within the saw tooth recess of that tooth T of the saw to besharpened so as to accurately grind the tooth under surface E (seeFig. 1) to sharpen the tooth cutting edge T, and which ma chine is movedfrom tooth to tooth around the saw to successively sharpen the saw teethT thereof. In the illustratedembodiment of such a machine, it includes asubstantially flat, disc-like circular casing 10 within which thedriving gearing for the rotary and reciprocatory grinding wheel ishoused, and which casing 10 forms the base and support for the variousmechanisms and structures making up the machine. The main driving shaft11 of the machine is mounted extending axially through casing 10 andournaled in alined exteriorly ex ended opposite side bearing bosses orhub members 12. Shaft 11 at the outer or front operating side of casing10 extends outwardly a distance therefrom and at the outer end thereofan operating crank handle ll is fixed thereto for rotating shaft 11,while the opposite end of shaft 11 at the saw blade side of casing 10terminates at and within the bearing boss 12 therefor (see Figs. 3 and41-). The main driving gear 15 is fined on the shaft 11 within thehousing for rotation by and with such shaft, and gear 15 engages andmeshes with a pinion 16 within the casing mounted on a shaft 17journaled in suitable bearings in the casing opposite Walls 5 to; Figs.1 and 2; The shaft; 17 *is extended outwardly from: the; easing at; thefront or v: operating sideithereof end a belt-"pulley 18 is fixed-zliere'ongfor rotetionthereby, such;

pulley 'beiiiggdisposed ibetween thekcasinganx'lzf theiplane ofrotation-1oiicrenlzihandle 14;..as

shown by -'Figs.m 1 t and 2 of: thewdrawingss Thusehy rotatingycrankhandle 14,"theapulleyc itatedathrough piniQILlGvand; driving;

geer'llfimeshed therewith;

.Tlic :rotery grindinggwheel 20 byiwhichi the 1 saw teeth" are groundzandcsharpen ed, [sucln ling formed of emery: or suchilike 1 1s mounted1 and and the inner end of section 212 0-1 zerrniAzisi formed. withnzienlargedi transversely; disposed. hub poi ion; ilxheving; an; axialopen ended hore thereth roughpwhichaslidably and ably fits oi'er. and.is received; on the "i523. y i r in. 'is inountedzin and extending-axugh stub for; reciprocation ally thereof, p n-Q5bei'ng slidablymounta tits outer endzin tlm shaft end .Wnll: and" edQ-f'i slidehly fitting thehereof. shaft" -6. extendedinwardly into thecasingiothe: aide of maindriving gen-i1 115;: (See- 1 i The outei endofz pin 25i-isse-cured tohuh extending; through a removable entlplateQSiixcdto tlie' oeteuendfofhub,- inoinliers so tliatthe min A andpiIi-Qfi are" recip ocahle on stubshaft 23 longitudinally; hereof toward and from the casing 10. e. maindriving gear 15 is provided with an minular cam 29, still referringjtoFig. 3,; onrthe side thereof adjacent head 26 of pin 25 vandin'lineivith head26 Whichbeavrsthere against Gain 29 is formed withmhigh side and a low side,- substentiellydiametrically oppos 2,-a-ndcoil expansion-springfiO is iiieunted 'Wllilll'fl' shaft 23 I around p n25 une der compression between: outeri end @Well of 3 and. pin head 26,.Thevspringi30 maintains ;pin"heed 26 pressed into engage,

- ient with cam 29 foroutward reciprocation against-the spring when :thehigh sldeof the:

cemengoges the; pin heed a-nd forces the pin and located '1' adj aeeutithe =20 uteri; lowers sid oftheeasmgms-Will be'cleanbymeference- S. ofarm A hy zi machinesoreW-orwith arm 1A: ,inwardlyioriqshaftflilesrtheslom side of thezce-in engages :head 26; .i

The arniA is supported land in'ainteinedb'n: c the desiredyerticalipositiom to locatewgrin ingwzwheel 2G' ettheoutercndxthereofiintheQ required position hby a vertically. disposed;bracket-t coinprisinggen outwardlyr disposed:

arm She-xtenddbelow en 1 A- and provided: v

with 1e 5 roller or; ball. 13210112 the upperi side thereof.- onyWhich;arm; JAE loosely rests. and l over: which it is reciproceble, endl theup extended 'rod .33 fitted in it vertically? disposed 1 derfreme fixedto and extend ing-upwerdlyfrom the casing; 510 spaced from 013b" rod eloxtenolss o blyvthroegh the outer end. of *rznne and; is ex ernallythreaded tore: coivesthe nut "which loosely rests upontheeframeupper'end. By rotating nut L357 rod-c PBS-is raised orloweredto raise oralower armi. g; 31 end raise OBlGWGT-gIlHClIHgQWl'lBBl terryin germ; A; which swings on shaft :23 Ease-an": 3X15; Tor-cgoing.arrangement is clean jl'fl 1 of the drziiylngsza is adjustablein length to further properly po ronsea-ndlocate the grinding WhBQl QQKmounted at. the outer enduthereofu. Lower:

t section 21 is formed. with e long tudinelt(Va shaped rib on the upperside elongJand 52 adj scent one 1 edge the outer) thereof, which:

ntsunto a'correspond :g'1OOVG 111 the under? side of: ugpercsection 22and upper section .22 E

- is-longitudinallyfchenneled'to provide ra flat-i faced rib v37'alongthe opposite edgeth-ereof: 5

Which'loears uponthe upper side of low er see-1 tion 2%, alliesqclealtlyshown by .F lgs; 5 ends Oftli-QdlilWlllgS: The section22 lSESHltELblYlongitudinally slotted to 'TBCGZVG the spaicedrz screws 38"whichextend..therethroughninto: 63

the lower sectionfll and slideblyconfine the sections-together. By the.-COI1Sl31L1Ctl1OI1L'21I1(l 1 arrangement of sections-21 andQZenywearxresulting-from sliding section 22v on section 21 a,

to adjust the length of arm Axis evenly taken" ib upendlziterelmisalignment 0rla-terehtilting;

. of'one sectionron the other is epreventedu 7 byedjusting mechanism,referring to Figsiil v end'B 'in particular, which coinprisesoxrodi- 1,

39 threaded forwardly through an ear lO'on; the :upper side of hubineniber 26 of lower armesectionQl. and extending forwardly to and?rotatnhlys'ecuredj in an ear 41 on the upper:

side of upper arm section 22. The lower' w .outenend ofrod 39 is formedWltllfl knurled operating heed orhandle 42 for rotating-thee same. Byrotating rodn39; the-upper arm; section 22 ice-n he slid outwardlyorinwardly onfalowersectionfil and the lengthofwernin= Aastadjustedtoproperly positioirthe outer,

.gninding; Wheel c-zirryi ng end thereof.

The grinding Wheel-2O isrotetablyinount ediat and carried by the outerend of upperseoti'on'22 of ermiA, referring to- Figgb of inner side'of"Inn A. The upper endiio'f 1' the drawings in particular, through themedium of the downwardly and outwardly eX- tending and diverging arms 43at the end of section 22. A grinding wheel shaft or spin- ,dle 44 ismounted extending across and between the outer ends of arms 43 and 1Sjournaled in suitable anti-friction bearings 45 carried by the armsrespectively, the spindle in the example hereof being extended throughthe ends of arms 43. The shaft or spindle 44 is positioned by arm Aspaced outwardly from and transversely with respect to casing 10, andextends across the casing at one end to the position of the saw bladewith the grinding wheel 20 secured on such end of the spindle forrotation therewith and thereby. A pulley 46 is fixed on spindle 44intermediate the arms 43 and substantially in line with the drivingpulley 18 therebelow on casing 10. An elastic or spring belt 47 isplaced under tension around and between pulleys 18 and 46 for rotatingspindle 44 and the grinding wheel 20. This elastic belt 47 furtherfunctions to swing arm A downwardly and maintain the same in operativeand adjusted position on the supporting arm 81 in contact with the ballor antifriction member 32 thereon for reciprocation thereover.

With the machine arranged as above described, rotation cf crank handle14, rotates driving gear 15, which in turn rotates pinion 16 and pulleyl8, and through belt 47 pulley 46 is rotated to drive spindle 44 androtate the grinding wheel 20. As gear 15 rotates the cam 29 thereon inengagement with pin head 26, reciprocates pin 25 and hub 24 on shaft 28,together with arm A and grinding wheel 20 as a unit, during and whilegrinding wheel 20 is rotated by spindle 44. Preferably, crank handle 14is arranged on shaft 11 with respect to cam 29 of ear 15, so that. asthe handle swings by and passes the outer end of arm A, the low side ofthe cam is engaging pin 25 and the arm A is in position moved inwardlytoward the casing. The arrangement of the pulleys 18 and 46 insubstantial alinement, (the distance of arm reciprocation beingrelatively small) and directly below and substantially in the plane ofthe longitudinal center of the arm A, is such that the force or pullexerted by belt 4? at the outer end of arm A is along the longitudinalcenter of the arm, so that any tendency to twist or displace the armlaterally is done away with and maintenance of the grinding wheel 20 intrue desired adjusted position is insured.

As an important feature thereof the invention provides for the mountingand supporting of the sharpening machine on a saw blade to posit-ion thegrinding wheel 20 for sharpening engagement with a saw tooth. Incarrying out this feature of the invention by the illustrated examplehereof, the

machine is supported in position with the casing 10 vertically disposedat and parallel to one side of the saw blade, such as the blade of saw Shere shown. The supporting mechanism embodies the bracket plate 48mounted for adjustment on and around shaft bearing 12 of shaft 11 on thesaw blade side of casing 10, and extending radially and up wardlytherefrom a distance beyond and above casing 10 and saw S. The bracketplate 48 is provided with an arcuate slot 49, referring here to Fig. 2of the drawings, adjacent its inner end through which a headed screw 50extends and is fixed to the casin to confine the plate on member 12against displacement, while an adjusting slot 51 is provided through theplate adjacent the upper side of casing 10 with a headed screw 52extended therethrough and engaged in casing 10. By loosening screw 52,bracket plate 48 can be swung in either dircction on member 12 to thedesired adjusted position and again secured by screw 52. A support lar53, referring to Figs. 2 and 4 of the drawings, is secured in the upperend of plate 48 and extends laterally and ou wardly therefrom above andtransversely of the saw S, and bears and rests upon the edge of the sawS to support the machine in position on the saw.

The bar 53 extends a distance outwardly from plate 48 beyond saw S andthen is bent downwardly and depends at substantially right anglestherefrom to form the arm 54 spaced outwardly a distance from casing 10and the saw S and terminating with its inner, lower end substantiallyopposite the center of the casing 10. A clamping block 55 is pivotallyor swingably mounted on a pin 56 in the lower end of arm 54 and extendsinwardly toward and at substantially right angles to the saw S. lheclamping block is swung by means of a hand lever 57 (see Fig. 4)downwardly to position bearing against the saw blade to clamp the bladebetween casing 10 and clamping block 55, or upwardly and outwardly toposition disengaged from the blade for release and removal of thesharpening machine as a unit from mounted position on the saw. In orderto secure the desired position of casing 10 against displacement fromclamped position, the side thereof adjacent saw S is provided with thespaced positioning abut-ments 58 thereon which bear against the sawblade and hold the casing in desired position with the s w blade engagedby clamping block 55.

A second point of support for the machine is provided by the pin carriedby and projecting laterally from an arm 60 which is pivotally adjustablysecured and clamped at its inner end on a lug G1 on the exterior of thesaw blade side of casing 10, and disposed between plate 48 and the outerend of grinding wheel carrying arm A (see Figs.

theunachine: is loosely;supported-Jonithe-saw a m-e375 :1 .and. -2)J'IllllB'JfiIllT '60 extends u pwardlyicbe yondithecasing lOtand. thepinf59 is-iadjustably-secured in: a: longitudinal: slot in; thetarm to 7positionthe spacing of the pint outwardly on this term.

across-the saw to and rests uponthecdge thereof odor-1n cendipeint outsupportiitor f e, va-ced Fa distance 'ifrom supq iortbar 3 theOUtQTJGHCiOfI pin-59being headedto eng e t e r bladeand prevent L I a cy l I therpin slipping la" iii-rho saw Wnen upon release of clamping isleek The invention provides further fomposisharpening machine: on? a.-saw S -nd :wheei 940i located thereon in b p onueirgagingvthe desiredsawtooth to .be sharpened, from and bythethroat 2 of amadjacent teeth. Inthe example hereaccelnplished "by bracket 62 'claniped onsupport bar 53%and extendingina from i e side of :such ibar opposite p ntitlsand iouterigrindingWheel carrying-ended:' in it; (see Figs. 11 ancli2). ilihctlracket i2 is -1adjlJSt2Lbl6EfiIOUIld *bar- 53 to; raise ;orrlower theouter end thereof, which carries the ,laterally projecting "positioningpin 68, referring; particularly to :Fig. fllxof the: drawings; which pinis adapted to extend transversely across sawS through a sawtoothrecessanid to in therthroat 2 ofwtooth zTi ofs such recess,

The; sha rp ening. machine o t the 1 invention Lin a posed 111211111611mounted and supportedzandwoperatii ely positioned onx the saw w :byplacing the iii-achine: on. thSwSZT-KV with thewsaw blade wettveen car11 110 and arm :54; and npportr bar baaand? supportingpin on thesawaedge at oppositesides 59"restiof :=a tooth recess .and bet-Ween suchrecess s adjacentteethrrecesses; respectively, atopposite sidesthereofreferring now to 'l antlfznfthedrawings. eTlaearm f-A is v 1 d as tot'thandavertioal position so as to dispose grinding wheel 2-0 in the:next adjacent tooth recess to the support pin 7 59, reamtardly withrespects-to: the direction .of saw rotation. The: positioning. pin- 63is. dis- 1 the tooth recess next forwardly; iadjaeent the supportbar,53'zandi-is engaged against and in the throatflofz toothTof such rec ;sThegrinding wheelcarrying arm A en given its a final adjustments:toxaccubeveler 1i le-rxiiace LT otthe tooth cuttin 1 I D to be -Sildi'l)see, all parts aretnen in their adjusted 1 POSitlOIlS, and 1 themachineisclaniped andlocked inposit-ion Er: by engaging clamping block55 stthesaw blade. Witl1tl1emasuch operative position, firmly and held'as'ainst vertical or lateral move I pracernents, the cranklt is arotated in the it proper direction which causes Pin :extendstransversely A b rotation ofugrinding Wheel 20and reciprocaitionitliereot; by the arm A across. the. tooth ll being-sharpened," toresultuin "an accurate sharpening andugrindingxof theitoothi to giverequired istraight :cuttingv-edge :T with n htlyihollowgground undersurface T. i )01'1- completion oiithe sharpening of the v tooth l *abovedescribed ,1 the iinachine is unclainped and released ifJOlTlwilllG sawis .and move lEfOlEW dlyson the-sawuntil positioning vein ntershthe n xt'iorward toothrecess, i sport bar 532%!1CLP1I1 59 then having moved topositions resting: on the saw (at; opposite zthe forward: tooth. recess,,and igl ending wvheel beingimoved to sharpening position withrespect:totootlrTsforward 1y adjacent theilast sharpened tooth. Theengagement of pint 63 with the tooth throat 2 Will then positiongrinding Wheel 20 fo1' sharpening the tooth T-with which engaged,,Whiclnithe A machine is. again :clancped and the tooth sharpening:operation by rotationiland reciprocation of} grinding Wheel .20isoarriedr'out. Due toithe positioning of the; grinding-Wheel. 20, fromthe throat 2 ofa tooth :by {the pin 63, as these teeth a are .all.accuratelysspacec apart. and: are .ffirinly held against movement, bytheir shoulders 1, in the direction in which pin 63 .acts: thereon, oncethe'desired adjnstinentsiof arm A, pin 63 and saav engaging: andmachine. supports "53 the, machine of the invention without. removing,the saw .from normal. operative position,

.or n; the case of inserted teeth such as. teeth 1 Without removing theteeth ifromithe saw. The machine "is quickly mounted on a saw and easilyreleased and a secured Line the 5 next sharpening postion thereon. The.reciprocationofrthegrinding Wheel assures of main taining. astraight-tooth cutting edge, and by the arrangement or the inventionfforreciprocating-the grinding nvheel carrying arm, and grindingvwheel rascaunit. in a straight path eliminates thei-tendencyof: the. arm or Wheelcarried i therebymto turn or twistQfrom true sharpeningal-inement. .Thespaced points of support on thesaw aflordediby bar 53, and 1331159,together-With positioning pin 63, maintain the machine inpostioniagainst vertical "displacement when the machine is clamped sin:postion on a sawby clamping block 55,-Which latter together withuabuui'nents "58 securely; hold '1 the machine against lateral displacement.By the various-adjusf inents provided fol: the: supporting and.posltioning members and for the grinding Wheel carrying reciprocatingarm, the machine is adapted to a wide range of saw sizes and saw toothspacings. The machine is also mechanically simple and of a compactarrangement rendering it easy to handle and operate with a minimumpossibility of mechanical failures in operation under conditionsencountered in the use thereof.

It is further evident that various changes, modifications, variations,eliminations, substitutions and additions might be resorted to inexpressing the broad features of the invention, and hence I do not wishto limit the invention in all respects to the exact and specificdisclosures hereof;

Desiring to protect my invention in the broadest manner legallypossible, what I claim, is:

1. A portable saw tooth grinding and sharpening machine for removablemounting on a saw to individually sharpen the saw teeth, comprising acasing for mounting in position at one side ofa saw, laterallyprojecting and adjustable supporting members for engaging over the outeredge of the saw at spaced points thereon between saw teeth to supportsaid casing in position on the saw, a rotary grinding wheel adj ust-ablysupported from the casing in postion for sharpening engagement with asaw tooth, means on the casing operatively associated with the grindingwheel for rotating said grinding wheel, and a positioning memberadjustably mounted on one of said laterally projecting supportingmembers for engagement with the throat of a saw tooth spaced from thetooth to be sharpened to locate and position the casing on a saw withthe grinding wheel in operative tooth sharpening position.

2. A portable saw tooth grinding and sharpening machine for mounting ona saw to individually sharpen the saw teeth, comprising a casing formounting at one side of and supported from the saw, an arm mounted onthe casing extending outwardly therebeyond, a tooth sharpening grindingwheel rotatably mounted at the outer end of said arm in position forsharpening engaging with a saw toot-h, means for rotating said grindingwheel, and means operated by said wheel rotating means for laterallyreciprocating said arm and grinding wheel as a unit simultaneously withthe rotation of said wheel.

3. A portable saw tooth grinding machine for mounting on a saw toindividually sharpen the saw teeth, comprising a casing for mounting atone side of and supported from the saw blade, an arm pivotally mountedat one end thereof on the outer side of the casing for vertical swingingthereof on a horizontal axis to adjust the vertical position of theopposite end of the arm, said arm lateral- 1y reciprocable toward andfrom the casing,

adjustable supporting means for the arm spaced from its mounting on thecasing, a

grinding wheel rotatably mounted at the outer end of the arm on an axistransverse of the arm and the saw with the grinding wheel in verticallydisposed position for grinding engagement with a saw tooth and rotationin the plane of the tooth, means for rotating said grinding wheel, andmeans actuated by the wheel rotating means for reciprocating said armand grinding wheel as a unit during rotation of the wheel to move thegrinding wheel back and forth across a tooth during grinding thereof byrotation of the grinding wheel.

4. In a p rtable machine for mounting on a saw to grind and sharpen thesaw teeth, a casing for mounting at one side of the saw, spaced laterally projecting supporting members for engaging over the edge of the sawto support the casing thereon, a positioning pin projecting laterallyfrom the casing to one side of and spaced from said supporting membersand adapted to engage in the throat of a saw tooth to position thecasing, a rotary grinding wheel supported from the casing at theopposite side of said supportint members from said positioning pin anddisposed substantially in the plane of a saw, the said pin when engagedwith the throat of a saw tooth positioning said grinding wheel inoperative relation with a saw tooth spaced from the positioning pinengaged tooth, means for reciprocating said grinding wheel, and meansfor releasably clamping said casing in position on a saw.

5. In a portable machine for mounting on a saw to sharpen the saw teeth,a casing, supporting members adjustably mounted on the casing forengaging the saw to support the casing in position at one side of thesaw, a stub shaft projecting laterally from that side of the casingopposite a saw, an arm pivotal ly and slidably mounted at one end onsaid shaft and extending upwardly and outwardly therefrom a distancebeyond the casing, means adjustably supporting the arm at a pointthereon spaced outwardly from said stub-shaft, a rotary grinding wheelmountet at the outer end of said arm for posi ioning thereby in grindingengagement with a saw tooth, a gear within the casing operativelyassociated with the grinding wheel for rotating the same, a cam on saidgear opposite said stub shaft, a pin slidably mounted axially of saidshaft connected at its outer end to said arm and engaged by the cam atits inner end, whereby rotation of said gear to rotate the grindingwheel simultaneously reciprccates said arm and grinding wheel laterallyas a unit.

6. In a portable saw sharpening machine for removable mounting on a sawto individually sharpen the saw teeth, in combination, a casing formounting on and supporting from the saw, spaced laterally projecttat.

waldlv thereloe ond maestro 111g supporting i anemhers on "the casingfor saw between engaging over the .1 edge: of h adj ustah ly: mounted onhand-supported I"rom the casingtiforrengagementiwithua saw tooth tosharpen the asame, sald grinding iwneel the teasing tor {engagingiinflthe: threat of; a

tooth spacedfromgtl e tooth to ee-sharpened for-positioning the casingto locate the. grind ringwieel in sharpening engagement with the th tohe sharpenedpineans for 1 removably laniping and securing,thereasingvonthesaev against; disnrlaeement ifrono the -1pesition 1 determined bysaid positioningmemher and 1 ieohanism eai 'ied by the casingoperatively o I a i 1 associated with said grinding wheel lori- 1 oathewheel :togrind andsharpen 7. A portable-sawtooth grinding machine ionremovable :mounting on a saw to grind andsharpen the sawteeth,--.einhodying a cas ing :for mounting-along one side-ofandre-:movaloly 1 supported 1 from the -saw blade, a

grinding wheel supported rfromo the l casing,

spaced therefrom end disposed in position with respect theretosuohlthat-with-the casing mount-ed one sawitlie griridingwheel disitposed substantially within the=plane 'ot the saw in grinding engagementwith the i saw t-ooth to be; sharpened, means oarriedhy the casing operati associ ated with the grind ing wheel for rotatingsaid-wheel andmechanism i tor a reoiprooating: saidigrinding wheel during: grindingrotation thereof, back and lfOlhli tlQLOSS c'slll'll transversely of thetooth being-sharpened. a h I 8. A. -.-saw lJOOl'lli grinding: and:sharpening muohine dor removable mounting 011 1 a "saw to individuallysharpen the saw teeth, Einbodying a casingfor mounting at. one side of asaw, means .f tor removahly supporting and securing the casing inposition one saw, an arm carried by the casing and extending outa sawtooth grinding wheel rotatably. iounted at'the onterend of said arm anddisp osed, withthecasing in mountedposition atone side of a saw,snhst-antia-lly intheplane oi' the saw in position" for grindingengagement with i saw tooth and in-cans carried lay the i easing loperatii ely assooiated with saidgrindingwheel for :rotating the same in-I the l plane of the tooth transverse-h of the tooth'cutt 4 9. A sawtooth grinding and sharpenn V1 maohineffor removable mounting one saw toindividually sharpen the saw teeth, hoidyingi a easing itor nnounting inposition disposed at. one sidesof :a saw; means forremovably;mountingwand seenr' gthe one i in position on land supportedfrom the saw a rotary, grihdingwheel, means sup i'tj ng :saidwgrindingwheel from the: casing in a poin vertically swung position to locate theggrlndlng wheel at a toothtobe sharpened, 11188411335012&Cl]L1Stl11gsaid arm longitudinally isitiondisposedsulostantially withinthe planeotithe-saw wvhenthe casing; is in mounted: position onra sawrthe;saichgrinding Wheel supporting meansadjustahie to move theggrind-'ingrrwheel to position the wheel in grinding and sharpening engagementwith'a tooth,

and Amechan-ism 'operatively associated with said grinding Wheel forrotating the same.

.210. Asaw tooth grinding machinefor rethe casing in position. onandsupported from movable mounting on a saw to sharpenthe m5 saw" teeth,comprisinga casing for mounting in position disposed at one side ofasaw, means for reniovahly mounting and seouring the saw anwarinpivotally-niounted on the B casingforyertical swinging on asubstantially @horizontal it axis and extending out- -wardly:heyondthecasing, a grinding wheel rotatahlysmounted atthe outer freeend ofsaid arm in position thereon such that with 1 1 "thecasing in mountedposition saidpgrinding wheel-is disposed substantially in the plane ofthe saw, means for maintaining said arm in 'Verticaliy .adj usted po i-ion with the grinding wheel disposed in grinding engage-m0 mentwith asaw tooth to hesharpened; and

niechanism operatively coupled with said grinding wheel forrotating-thesame.

, :11. A saw tooth glllldlllg-Elnh sharpening machine for removablemounting on wasa-w on;

'to sharpen the saw teetlnemhodying -casng' for -mount1ng 1n POSlBlOIlon :and supported hya sa-w an arin pivotally mounted onsaid casing forvertical swingingaand-extending outwardly beyond said casing, aid;grinding wheel rotatably mounted onsaid arm in such position thereonthat with 1 the casing mounted on a saw saidgrinding wheel is disposedsuhstantialiyin theplane oflthe saw, adjustable means supportingsaid armto moveVthem'rinding wheel into accurate sharpening QIlgElgS-HIGDiZWltila tootl1,and

mechanism operatively associated with the grinding wheel rfor rotatingsaid wheel to sharpen a tooth with which engaged.

12. Asaw tooth grinding and sharpening machine for-removablemounting ona saw tosharpen the saw teeth embodying a casing for mounting one-saw inposition supported along one side of the saw, means onthe casing forengaging over the-saw and removably securing the casing in positionthereon,

lflll arm disposed on the outer side out and extending outwardlyheyondthe casing -alrotary grinding wheel mounted on-the outer casing,and means for reciprocating said arm and grinding wheel as a unit duringrotation of the wheel to move the grinding wheel back and forth acrossthe tooth be ng sharpened.

13. A saw tooth grinding and sharpening machine for removable mountingon a saw to sharpen the saw teeth, embodying a casing for removablemounting on a saw, an arm mounted on the outer side of the casing andextending thereacross and outwardly therebeyond, said arm mounted forlateral reciprocation toward and from the casing, a rotary grindingwheel mounted at the outer end of said arm in such position thereon thatwith the casing in mounted position on a saw the grinding wheel isdisposed substantially in the plane of the saw for grinding engagementwith a tooth to be sharpened, a gear within the casing operativelycoiilpled with the grinding wheel for rotating the latter, means forrotating said gear, and means carried by the gear operatively associatedwith said arm for reciprocating the arm and grinding wheel as a unitduring r tation of the grinding wheel.

14. The combination in' a portable machine for removable mounting on asaw to sharpen the saw teeth, of a casing for mounting on a saw, arotary grinding wheel supported from the casing and positioned withrespect thereto so that the grinding wheel is disposed in substantiallythe plane of the saw in grinding engagement with a saw tooth forrotation in the plane of the tooth, said grinding wheel mounted foraxial reciprocation, means for rotating the grinding wheel, and meansfor reciprocating the grinding wheel back and forth across a toothsimultaneously with and during the rotation of the grinding Wheel.

15. In a portable saw sharpening machine for removable mounting on a sawto grind and sharpen the saw teeth, a casing for mounting on a sawsupported in position thereon vertically disposed along one side of asaw, spaced laterally projecting members at the upper side of the casingfor engaging over the upper edge of the saw between saw teeth to supportthe casing in position, a rotary grinding wheel supported from thecasing in position disposed substantially in the plane of the'saw forengaging a saw tooth spaced around the saw from said casing supportingmembers, mechanism carried by the casing op-eratively associated withsaid grinding wheel for rotating said wheel to grind and sharpen atooth, a d a laterally projecting positioning pin on the casing spacedfrom said supporting members at the opposite side thereof from thegrinding wheel for engaging in the throat of a saw tooth to position thecasing and grinding wheel on the saw and maintain the same againstdisplacement tending to move the grinding wheel to Ward a tooth beingsharpened.

16. A saw sharpening machine for removable mounting on a saw to grindand sharpen the saw teeth, a casing for removable mounting on asaw, astub shaft projecting laterally from the outer side of the casing, anarm slidably mounted on said shaft and extending radially therefromoutwardly across and beyond the casing, a rotary grinding Wheel mountedat the outer end of said arm in position thereon such that with thecasing mounted on a saw said grinding wheel is disposed in grindingengagement with the saw tooth to be sharpened, a gear within the casing,means for rotating said gear, transmission means operatively associatingsaid gear with said grinding wheel for rotating the latter, a cam onsaid gear, and means operatively coupled with said arm and actuated bysaid cam for laterally reciprocating said arm and grinding wheel as aunit as said gear is rotated to reciprocate said grinding wheel back andforth across the tooth being ground.

17. A saw sharpening machine for removable mounting on a saw toindividually sharpen the saw teeth, embodying a casing for mounting atone side of and supported from the saw blade, an arm mounted on theouter side of the casing and laterally reciprocal toward and from thecasing, said arm extending outwardly beyond the casing, a grinding wheelrotatably mounted at the outer end of the arm in such position thereonthat with the casing mounted on a saw the grinding wheel is disposed ingrinding engagement with a saw tooth for rotation in the plane of thetooth, means for rotating said grinding wheel, and means actuated by thewheel rotating means for reciprocating said arm and grinding wheel as aunit to move the grinding wheel back and forth across a tooth duringgrinding of the tooth by the rotation of the grinding wheel.

18. A saw sharpening machine for removable mounting on a saw toindividually sharpen the saw teeth, embodying a casing for mounting atone side of and supported from a saw blade, a stub shaft projectinglaterally from the outer side of the casing. an arm slidably mounted onsaid shaft and extending radially therefrom outwardly across the casing,a rotary grinding wheel mounted on said arm in such position thereonthat with the casing mounted on a saw the grinding wheel is disposed ingrinding engagement with a saw tooth for rotation in the plane of thetooth, a gear within the casing, means for rotating said gear,transmission mechanism operatively coupling said gear with the grindingwheel for rotating the latter, a cam on said gear opposite said stubshaft, a pin slidably mounted axially on said shaft and connected at itsouter end to said arm, and said pin engaged at its inner end by said camwhereby rotation of said gear to rotatethe grinding wheel simultaneouslyreciprocates said arm and grinding wheel laterally as a unit.

Signed at Oxford, county of Granville,

State of North Carolina, this 7 day of August, 1930.

LEE M. LOFTIN.

